<template>
    <div :class="className" :style="{height:height,width:width}" />
</template>

<script>
import echarts from 'echarts';

require('echarts/theme/macarons'); // echarts theme
import {debounce} from '@/utils';

export default {
    props: {
        className: {
            type: String,
            default: 'chart'
        },
        width: {
            type: String,
            default: '100%'
        },
        height: {
            type: String,
            default: '300px'
        }
    },
    data() {
        return {
            chart: null
        };
    },
    mounted() {
        this.initChart();
        this.__resizeHandler = debounce(() => {
            if (this.chart) {
                this.chart.resize();
            }
        }, 100);
        window.addEventListener('resize', this.__resizeHandler);
    },
    beforeDestroy() {
        if (!this.chart) {
            return;
        }
        window.removeEventListener('resize', this.__resizeHandler);
        this.chart.dispose();
        this.chart = null;
    },
    methods: {
        initChart() {
            this.chart = echarts.init(this.$el, 'macarons');
            const axisData = ['周一', '周二', '周三', '很长很长的周四', '周五', '周六', '周日'];
            const data = axisData.map(function(item, i) {
                return Math.round(Math.random() * 1000 * (i + 1));
            });
            const links = data.map(function(item, i) {
                return {
                    source: i,
                    target: i + 1
                };
            });
            links.pop();
            this.chart.setOption({
                title: {
                    text: '笛卡尔坐标系上的 Graph'
                },
                tooltip: {},
                xAxis: {
                    type: 'category',
                    boundaryGap: false,
                    data: axisData
                },
                yAxis: {
                    type: 'value'
                },
                series: [
                    {
                        type: 'graph',
                        layout: 'none',
                        coordinateSystem: 'cartesian2d',
                        symbolSize: 40,
                        label: {
                            normal: {
                                show: true
                            }
                        },
                        edgeSymbol: ['circle', 'arrow'],
                        edgeSymbolSize: [4, 10],
                        data: data,
                        links: links,
                        lineStyle: {
                            normal: {
                                color: '#2f4554'
                            }
                        }
                    }
                ]
            });
        }
    }
};
</script>
